Show validation message when validation fail

I have Post model in which I've defined validation rules:

var $validate = array(
'range' => array(
'rule' => array('range', 1900, 2010),
'message' => 'Between 1900 and 2010.'
)
);

and I've the PostsController, with an easy add function:
function add() {
if (!empty($this->data)) {
if ($this->Post->save($this->data))
{
// HANDLE SUCCESS
}
else
{
// HANDLE VALIDATION ERROR
$this->Session->setFlash("generic error");
}
}
}

How I've to code the 'else' branch to show validation error message
defined inside model?
Especially I would show "between 1900 and 2010." as error rather thn
"generic error"

Regards

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